Hydraulic-valve plunger



s. J. RANDALL HYDRAULIC VALVE PLUNGER Filed May 14 1923 2 Sheets-Shea?, l

"retenue ret. ie, teas.

T E@ ST "E S SAMUEL J. RANDALL, OF YOUNGSTOWN, OHIO.

HYDRAULICfVALVE PLUNGER.

Application led May 14., 1923. `Serial N'o. `638,786.

` To all whom tmay/ concern:

Be it known that I, SAMUEL J. RANDALL, a citizen of the United States, residing at Youngstown, county of Mahoning and State of Ohio, have invented a new and useful Improvement in HydraulioValve Plungers, of which the following is a full, clear, and exact description.

This invention relates to hydraulicl valve plungers and is particularly .directed toward a hydraulic valve plunger embodying a metallic packing.

Hydraulic valve plungers are generally constructed with cup leather packings. These cup leathers Ygenerally wear rapidly and must be replaced to prevent leakage of the valve. I provide a metallic packing ring which is free from the numerous ob jections to cup leathers and which will last indenitely. I also provide an adapter spool which may be used with the plunger parts generally used when cup leathers are employed, the adapter spool co-operating with such parts to provide grooves for the metallic packing rings.

In the accompanying drawings illustrating the preferred embodiment of my invention,

Figure 1 is a vertical section through a hydraulic valve embodying my invention;

Figure 2 is a section to enlarged scale through the valve plunger;

Figure 3 is a sectional perspective of one of the spools employed.

Figures fl and 5 are perspective and top plan views, respectively, of the metallic packing ring, and

Figure 6 is a perspective view of the adapter spool.

In the illustrated embodiment of the invention, the hydraulic valve plunger comprises a series of spools mounted on a stem 2, this stem being provided with a collar 3 against which the upper spool seats and being threaded at the bottom for a pair of nuts i which clamp the spools together and hold them in place. The other end of the stem is carried through a stuffing box and is operatively connected to a valve handle 5.

Referring to Figure 2, the plunger proper comprises end spools 6, a pair of adapter spools 7 and a central spacer 8. The spools 6 and 8 are both provided with reduced portions 9 adapted to receive metallic packing rings 10. The rings 10 are s lit rings as clearly shown in Figure l an are preferably provided with agroove v11. Ports 12 connect the bottom of the groove with the inside of the ring and serve to communicate hydraulic pressure to the back of the ring, thus insuring the expansion of the ring 'at all times.

'lheadapter spools 7 are provided at each end with a rimy 13 which tsover the reduced portion KV9 of the spools Gand 8 and provides a groove of the proper dimensions for the packing ring 10.

It will be'noted that lthe reduced portions 9 of the spools 6 and 8 are :considerably broader than the packing ring 10. This construction is advantageous notl only in providing a strong and serviceable plunger but the reduced portions 9 are also wide enough to accommodate a cup leather if it should be desired. By selecting packing rings of the proper size, it is possible to utilize the principal parts of a hydraulic valve plunger as used with cup leathers, it being necessary only to remove the cup leathers, and the spacer ring between them if one is used, and replace them with the adapter spool 7 The rims 13 of the adapter spool occupy the space which would be occupied by that portion of the rims of the cup leathers lying adjacent their bases and leave unoccupied the remainder of the rim space thereby supplying a pair of spaced grooves. The body of the spool fills the space which would be occupied by the bases of the cup leathers and maintains the valve plunger at its proper length.

I provide a hydraulic valve plunger of simple construction and great durability. The expansion rings with the relief ports to the back of the ring equalize the pressure on both faces and insure proper sealing at all times. The metal expansion rings will not become ragged due to wear as is the case with the cup leathers and in any event may be readily replaced without troublesome litting or wearing-in.

While I have illustrated my invention as applied to a hydraulic valve plunger having spaced packings at each end thereof, it will be understood that it is not limited to the construction shown but may be otherwise embodied within the scope of the following claims.

I claim:

1. A hydraulic valve plunger including a stem, two spools thereon each having a reduced portion adapted to receive a metallic lill) packing ring, the rings being narrower than the reduced portions, and a spool adapted to fit between the first mentioned spools and having oppositely disposed rims adapted to fit over the reduced portions and co-operate with them to form a pair of spaced-apart grooves for the metallic packing rings when the plunger is assembled, substantially as described.

2. A hydraulic valve plunger including a stem, a spool thereon having a reduced porvtion adapted to receive a metallic packing ring, the ring being narrower than the reduced portion, a second spool having a rim adapted to fit over the reduced portion of the iirst spool and co-operate with it to form a groove for the metallic packing ring when the plunger is assembled and a port connecting the bottom of said groove with the outside of the plunger when the ring is in place, substantially as described.

3. In combination with a hydraulic valve plunger having a spool adapted to fit into and support a cup leather packing, an

adapter spool arranged to occupy the space which would Ybe occupiedjby the base and a portion oil the rim of the cup leather and leave unoccupied another portion of the space which would be occupied byl the rim of the cup leather, and a metallic Vpacking therein, substantially as described.

4. In combination with a hydraulic valve,

plungers having spools adapted to fit into my hand.` A

SAMUEL J. RANDALL. 

